google/syzkaller

syzkaller is a coverage-guided kernel fuzzer that automatically discovers bugs in operating system kernels through unsupervised fuzzing.

The tool addresses the challenge of finding security vulnerabilities and stability issues in kernel code by generating and executing randomized system call sequences. It uses coverage feedback to guide its fuzzing strategy, meaning it tracks which code paths have been exercised and prioritizes generating new inputs that reach unexplored areas of the kernel. This approach is more effective than random testing because it systematically explores the kernel's behavior space rather than blindly hammering it with arbitrary inputs.

Syzkaller is suited for kernel developers, security researchers, and maintainers who need to identify bugs before they reach production. It works across multiple operating systems and architectures, making it applicable to projects maintaining kernels or kernel-adjacent code. The tool is particularly valuable for continuous integration pipelines where automated fuzzing can run alongside traditional testing to catch edge cases and race conditions that manual testing might miss. Organizations with security-focused development practices benefit most from integrating syzkaller into their testing infrastructure.

The project maintains active development with regular commits addressing new kernel features and fuzzing strategies. The codebase receives ongoing refinement to improve crash detection and reporting accuracy. The tool continues to evolve with enhancements to its coverage instrumentation and input generation heuristics. Development activity shows sustained attention to expanding support for additional kernel subsystems and architectures.